package com.example.test_1_21.mqserver.core;

import com.example.test_1_21.common.ConsumerEnv;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;

//MSGQueue=Message Queue，表示一个存储消息的队列
public class MSGQueue {
    //表示队列的身份标识
    private String name;
    //表示队列是否持久化，true表示持久化保存，false表示不持久化
    private boolean durable =false;
    //为true表示这个队列只能被一个消费者使用，为false表示都能使用
    private boolean exclusive=false;
    //表示没有人使用是否自动删除
    private boolean autoDelete=false;
    //表示扩展参数
    private Map<String,Object> arguments=new HashMap<>();
    //当前队列都有哪些消费者订阅
    private List<ConsumerEnv> consumerEnvList=new ArrayList<>();
    //记录了当前取到了第几个消费者，方便实现轮询策略
    private AtomicInteger consumerSeq=new AtomicInteger(0);

    //添加一个新的订阅者
    public void addConsumerEnv(ConsumerEnv consumerEnv) {
        consumerEnvList.add(consumerEnv);
    }
    //订阅者的删除先不考虑
    //挑选一个订阅者，用来处理当前的消息，按照轮询的方式
    public ConsumerEnv chooseConsumer(){
        if(consumerEnvList.size()==0){
            return null;
        }
        int index=consumerSeq.get()%consumerEnvList.size();
        consumerSeq.getAndIncrement();
        return consumerEnvList.get(index);
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public boolean isDurable() {
        return durable;
    }

    public void setDurable(boolean durable) {
        this.durable = durable;
    }

    public boolean isExclusive() {
        return exclusive;
    }

    public void setExclusive(boolean exclusive) {
        this.exclusive = exclusive;
    }

    public boolean isAutoDelete() {
        return autoDelete;
    }

    public void setAutoDelete(boolean autoDelete) {
        this.autoDelete = autoDelete;
    }

    public String getArguments() {
        ObjectMapper objectMapper=new ObjectMapper();
        try {
            return objectMapper.writeValueAsString(arguments);
        }catch (JsonProcessingException e){
            e.printStackTrace();
        }
        return "{}";
    }

    public void setArguments(String argumentsJson) {
        ObjectMapper objectMapper=new ObjectMapper();
        try {
            this.arguments=objectMapper.readValue(argumentsJson, new TypeReference<HashMap<String, Object>>() {});
        }catch (JsonProcessingException e){
            e.printStackTrace();
        }
    }

    public Object getArgument(String key){
        return arguments.get(key);
    }

    public void setArguments(String key,Object value){
        arguments.put(key,value);
    }

    public void setArguments(Map<String,Object> arguments){
        this.arguments=arguments;
    }
}
